217393461 has 12 divisors (see below), whose sum is σ = 314251392. Its totient is φ = 144818856.

The previous prime is 217393457. The next prime is 217393469. The reversal of 217393461 is 164393712.

It is not a de Polignac number, because 217393461 - 2² = 217393457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217393469) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4380 + ... + 21306.

It is an arithmetic number, because the mean of its divisors is an integer number (26187616).

Almost surely, 2^217393461 is an apocalyptic number.

It is an amenable number.

217393461 is a deficient number, since it is larger than the sum of its proper divisors (96857931).

217393461 is a wasteful number, since it uses less digits than its factorization.

217393461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18360 (or 18357 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 217393461 is about 14744.2687509418. The cubic root of 217393461 is about 601.2874770288.

It can be divided in two parts, 21739 and 3461, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 217393461 in words is "two hundred seventeen million, three hundred ninety-three thousand, four hundred sixty-one".